<template>
  <div id="app">
    <!--导航栏-->
    <nav-bar/>
    <!--手机屏幕下显示的搜索框-->
    <div  class="hidden-sm-and-up searchd"><search-box/></div>
    <!--下面的部分通过路由动态决定渲染与否-->
		<!--exclude,其值为正则，匹配到的组件的名称会被排除在keep-alive之外-->
    <keep-alive exclude="Player,CollectionList,HistoryList" >
      <router-view/>
    </keep-alive>
    <!--页脚-->
    <footer-bar/>
    <!--回到顶部按钮-->
    <el-backtop :visibility-height="100" :bottom="60" />
  </div>
</template>

<script>
  import NavBar from "components/navbar/NavBar"
  import SearchBox from "components/searchbox/SearchBox";
  import FooterBar from "components/footerbar/FooterBar";

export default {
  name: 'App',
  components: {
    FooterBar,
    SearchBox,
    NavBar
  },
  methods: {

  },
  created () {



    /**
     * 防止vuex中的state在界面刷新后丢失
     */
    //在页面加载时读取sessionStorage里的状态信息
    if (sessionStorage.getItem("store") ) {
      this.$store.replaceState(Object.assign({}, this.$store.state,JSON.parse(sessionStorage.getItem("store"))))
    }

    //在页面刷新时将vuex里的信息保存到sessionStorage里
    window.addEventListener("beforeunload",()=>{
      sessionStorage.setItem("store",JSON.stringify(this.$store.state))
    })
  }

}
</script>

<style>
  @import "assets/css/base.css";

  #app {
    overflow-y: scroll;
  }
  .searchd {
    margin-top: 15px;
    text-align: center;
  }


  /*.fade-enter-active,.fade-leave-active {
    -webkit-transition:opacity 1s;
    transition:opacity 1s
  }
  .fade-enter,.fade-leave-to {
    opacity:0
  }*/

  </style>
